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Brayton cycle. It is expected in the future that high temperature materials will become available and a high performance design with turbine inlet temperatures of 700oP PC will be possible. This high performance design achieves a thermal efficiency approaching 53%, which yields additional cost savings. The turbomachinery is highly compact and achieves efficiencies of more than 90%. For the 600 MWBthB/246 MWBeB power plant the turbine body is 1.2 m in diameter and 0.55 m long, which translates into an extremely high power density of 395 MWBeB/m3P P. The compressors are even more compact as they operate close to the critical point where the density of the fluid is higher than in the turbine. The power conversion unit that houses these components and the generator is 18 m tall and 7.6 m in diameter. Its power density (MWBeB/m3P P) is about ~ 46% higher than that of the helium GT-MHR (Gas Turbine Modular Helium Reactor). A by-pass control scheme is shown to be applicable to the supercritical COB2B cycle and exhibits an almost linear efficiency decrease with decreasing power. The use of inventory control is difficult since it controls the cycle by changing the operating pressure, which changes the split of the flow between two compressors that work in parallel. The change is so significant that the compressors cannot cope with it. This is mainly because of the current cycle design with a single shaft synchronized with the grid, which was chosen in order to simplify the plant layout, the start-up procedure and eliminate the need for a startup motor. Multiple shaft layouts or compressors with adjustable blade geometry would be necessary to overcome this problem. Since these modifications would increase the capital cost of the system they are not pursued in the present work, which emphasizes base-load performance. The cycle should be considered for future applications and a more detailed follow-on investigation leading to a demonstration and full-scale industrial unit should be pursued. Overall, it can be stated that this feasibility study has proven the high potential of the supercritical COB2B recompression cycle. 296PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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